<template>
	<view v-if="goods_info.goods_name">
		<!-- 轮播图区域 -->
		<swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
		  <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
		    <image :src="item.pics_big" @click="preview(i)"></image>
		  </swiper-item>
		</swiper>
		<!-- 商品信息区域 -->
		<view class="goods-info-box">
			<!-- 商品价格 -->
			<view class="price">￥{{goods_info.goods_price}}</view>
			<!-- 信息主题区域 -->
			<view class="goods-info-body">
				<!-- 商品名称 -->
				<view class="goods-name">{{goods_info.goods_name}}</view>
				<!-- 收藏 -->
				<view class="favi">
					<uni-icons type="star" size="18" color="gray"></uni-icons>
					<text>收藏</text>
				</view>
			</view>
			<!-- 运费 -->
			<view class="yf">快递：免运费 -- {{cart.length}}</view>
		</view>
		<!-- 商品详情页面 -->
		<rich-text :nodes="goods_info.goods_introduce"></rich-text>
		<!-- 商品导航组件 -->
		<view class="goods_nav">
			<uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick"></uni-goods-nav>
		</view>
	</view>
</template>

<script>
	import { mapState } from 'vuex'
	import { mapMutations } from 'vuex'
	import { mapGetters } from 'vuex'
	export default {
		watch: {
			//监听total的变化
			total: {
				handler(newVal) {
					const findResult = this.options.find((x) => x.text === '购物车')
					
					if (findResult) {
						findResult.info = newVal
					}
				},
				//immediate 属性用来声明监听器，是否在页面初次加载完毕后立即使用
				immediate: true
			},
		},
		computed: {
			...mapStatue('m_cart', ['cart']),
			//把m_cart中的名称为total的getter映射到当前页面使用
			...mapGetters('m_cart', ['total']),
		},
		data() {
			return {
				//商品详情对象
				goods_info: {},
				// 左侧按钮组的配置对象
				options: [{
					icon: 'shop',
					text: '店铺'
				}, {
					icon: 'cart',
					text: '购物车',
					info: 2
				}],
				//右侧
				buttonGroup: [{
					text: '加入购物车',
					backgroundColor: '#ff0000',
					color: '#fff'
				},
				{
					text: '立即购买',
					backgroundColor: '#ffa200',
					color: '#fff'
				}]
			};
		},
		onLoad(options) {
			//获取商品ID
			const goods_id = options.goods_id
			//调用请求商品详情数据的方法
			this.getGoodsDetail(goods_id)
			//console.log(goods_id)
		},
		methods: {
			async getGoodsDetail(goods_id) {
				const {data: res} = await uni.$http.get('/api/public/v1/goods/detail', { goods_id } )
				if (res.meta.status !== 200) return uni.$showMsg()
				
				//使用字符串replace方法，解决图片底部空白间隙问题
				res.message.goods_introduce = res.message.goods_introduce.replace(/img /g, '<img style="display:block;" ').replace(/webp/g, 'jpg')
				this.goods_info = res.message
			},
			//实现轮播图预览效果
			preview(i) {
				// 调用 uni.previewImage() 方法预览图片
				uni.previewImage({
					// 预览时，默认显示图片的索引
					current: i,
					// 所有图片 url 地址的数组
					urls: this.goods_info.pics.map(x => x.pics_big)
				})
			},
			onClick(e) {
				console.log(e)
				if (e.content.text === '购物车') {
					uni.switchTab({
						url: '/pages/cart/cart'
					})
				}
			},
			buttonClick(e) {
				if (e.content.text === '加入购物车') {
					//组织一个商品的信息对象
					const goods = {
						goods_id: this.goods_info.goods_id,
						goods_name: this.goods_info.goods_name,
						goods_price: this.goods_info.goods_price,
						goods_count: 1,
						goods_small_logo: this.goods_info.goods_small_logo,
						goods_state: true
					}
					
					//通过调用addtocart方法 存储到购物车
					this.addToCart(goods)
				}
			},
			...mapMutations('m_cart', ['addToCart']),
		}
	}
</script>

<style lang="scss">
swiper {
	height: 750rpx;
	
	image {
		width: 100%;
		height: 100%;
	}
}

//商品信息区域的样式
.goods-info-box {
	padding: 10px;
	padding-right: 0;
	
	.price {
		color: #c00000;
		font-size: 18px;
		margin: 10px 0;
	}
	
	.goods-info-body {
		display: flex;
		justify-content: space-between;
		
		.goods-name {
			font-size: 13px;
			padding-right: 10px;
		}
		
		//收藏
		.favi {
			width: 120px;
			font-size: 12px;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			border-left: 1px solid #efefef;
			color: gray;
		}
	}
	
	//运费
	.yf {
		margin: 10px 0;
		font-size: 12px;
		color: gray;
	}
}

.goods-detail-container {
	padding-bottom: 50px;
}

.goods_nav {
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100%;
}
</style>
